Quoted from Azfalconfixer:
Made a little progress. I disconnected pins 1 and 2 on J120. Put a mirror to see behind the driver board and saw jumper wires. I had no continuity from J115 to Q18 and Q10. Somebody jumpered Q18 on the wrong side. I changed that and now the upper lights work. Q10 didn't have a jumper so I installed one but then all the lights went real dim. So I disconnected it figuring there's some sort of short. I'll look more into that today. Also still don't have any back box flashers.
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- Ok so I got all the back box GI lights working.
- The back box flashers mostly was burned out bulbs. Got most of them working.
- Still have an issue with one flasher blub in the back box and playfield that stay on all the time. They come on as soon as the machine is turned on. Going through the schematic it's transistor's Q34 and Q33. Ohm'd them out and they seem to check good (they check the same as the rest around them). Diodes and resisters seem to check ok. Nothing looks burned or that it got hot. U3 IC looks like it has been replaced. Ohm'd it out the best I could and seems to be ok.
Not sure where to look from here?
For now I've removed these two bulbs.T2 Issue.pdf